/* 重置、基础排版、栅格与区块 */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-delay: 0s !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}

body {
  margin: 0;
  background: var(--c-paper);
  color: var(--c-stone);
  font-family: var(--f-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; height: auto; }

h1, h2, h3, h4 { margin: 0; color: var(--c-ink); line-height: var(--lh-title); font-weight: 600; }
h1, h2 { font-family: var(--f-serif); letter-spacing: .01em; text-wrap: balance; }
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-family: var(--f-sans); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--c-green); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--c-green-dk); }

ul, ol { margin: 0; padding: 0; list-style: none; }

:focus-visible { outline: 2px solid var(--c-green); outline-offset: 3px; border-radius: 2px; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  padding: 8px 16px; background: var(--c-green-dk); color: var(--c-cream); border-radius: var(--radius);
}
.skip-link:focus { top: 12px; color: var(--c-cream); }

/* 容器与区块 */
.container { width: 100%; max-width: calc(var(--container) + var(--gutter) * 2); margin: 0 auto; padding: 0 var(--gutter); }

.section { padding: var(--sp-section) 0; }
.section--cream { background: var(--c-cream); }
.section--dark { background: var(--c-green-dk); color: rgba(246, 243, 236, .78); }
.section--dark h2, .section--dark h3 { color: var(--c-cream); }

/* 栅格 */
.grid { display: grid; gap: var(--sp-block) clamp(24px, 3vw, 48px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--5-7 { grid-template-columns: 5fr 7fr; align-items: start; }
.grid--7-5 { grid-template-columns: 7fr 5fr; align-items: start; }

@media (max-width: 991px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--5-7, .grid--7-5 { grid-template-columns: 1fr; }
}
@media (max-width: 767px) {
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
}

.text-measure { max-width: var(--text-measure); }
.small { font-size: var(--fs-small); }

/* 只在宽屏生效的换行，避免手机上出现孤字行 */
.br-lg { display: none; }
@media (min-width: 992px) { .br-lg { display: inline; } }